Corer



FIG. 1 is a top, front perspective view of a corer embodying my new design;

FIG. 2 is a front elevational view thereof, of which the left side, right side, and back are identical;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a corer, as shown and described. 